Disappearing spouts for dispensing cans



April 5, 1955 w. MACK DISAPPEARING SPOUTS FOR DISPENSING CANS 2 Sheets-Sheet 1 Filed June 9, 1952 FIG.

FIG.2

INVENTO'R WILLIAM MACK April 5, 1955 w MACK DISAPPEARING SPOUTS FOR DISPENSING CANS 2 Sheets-Sheet 2 Filed June 9, 1952 FIG. 6

a I 3 8 w w w. 0 6 8 3 Q 7 3 ,AZ w K: 9 w vg 5 7-. 8 .7 l 5 8 8 w 4 4 4 7 on s w :70

FIG. 5 12 ATTOR NE Y United States Patent DISAPPEARING SPOUTS FOR DISPENSING CANS William Mack, Pittsburgh, Pa., assignor to the United States of America as represented by the Secretary of the Army Application June 9, 1952, Serial No. 292,462

14 Claims. (Cl. 222-526) position substantially entirely outside of the can and a retracted or non-use position wherein the spout is disposed substantially entirely inwardly of the can. spouts are well known but usually either lack entirely any means for retaining the spout in the dispensing position or rely on securing means such as mating screw threads or bayonet-type lock joints for securing the spout extended. The first arrangement is objectionable because any pressure on the spout in a retracting direction partially retracts it and causes leakage at the joint between the can and spout. On the other hand, the positive locks last mentioned are relatively slow to operate and are prone to leak after the joints wear slightly.

With the foregoing in view, it is an object of my invention to provide improved and quick operating means for securing the spout in the dispensing position and simultaneously providing a sealed joint between the spout and can.

A further object is to provide such an improved means which substantially eliminates wear of the metal parts and restricts wear to a readily replaceable gasket.

A further object is to provide in such an improved device a toroidal ring of resilient sealing material which is interposed between the spout and the can so as to be rolled axially of the spout as the latter moves to the dispensing position whereby to be compressed between the spout and can when the spout is extended so as to provide a seal while simultaneously resisting return movement of the spout to the retracted position.

A further object is to provide in a device such as that last described, means resiliently locking said ring and spout against return movement.

Other objects and advantages reside in the particular structures of the several forms of the invention, the structures of the elements forming the same, combinations and sub-combination of such elements, all of which will be readily apparent to those skilled in the art upon reference to the attached drawing in connection with the following specification wherein the invention is shown, described and claimed.

In the drawing:

Figure 1 is an elevational view of a preferred form of the invention, parts being broken away and shown in longitudinal vertical section, the device being shown in the retracted position;

Figure 2 is a view like Figure 1 but with the parts being shown in the dispensing positions;

Figure 3 is a view like Figure 1 but on an enlarged scale and showing a modification of the invention in the retracted position, parts being broken away;

Figure 4 is a view like Figure 3 but showing the modification in the dispensing position; and

Figures 5 and 6 are views like Figures 3 and 4 but show a still further modification of the invention in the retracted and dispensing positions.

Referring specifically to the drawing, wherein like reference characters have been used throughout the several views to designate like parts, and referring at first to the form of invention of Figures 1 and 2, 10 designates a wall of a dispensing can or other container which has threadedly secured thereto in any suitable manner, as by the sput 11, a closure cap 12. The cap 12 mounts the usual gasket 13. Cap 12 is axially apertured and has secured thereto in any suitable ma nner, a tubular guide Such ice

fitting 14. An upper portion 17 of the fitting 14 extends beyond the wall 10 and may be formed with any suitable means such as the screw threads 15, for securing any suitable closure cap 16 thereto. The cap 16 has a pivot pin or the like 34 secured thereto in any suitable manner so as to project upwardly of the cap centrally thereof. An arm is pivoted to pin 34. The cap 16 can be tethered to the wall 10 by connecting latter to arm 35 by any suitable flexible tether, not shown. The fitting 14 includes a lower portion 18 which extends into the interior of the can and which is of greater internal diameter than the upper portion 17.

A spout 20 has an outer end fitting 19 which is sized for a free sliding fit in the upper portion 17 of the can fitting 14. A flange 21 on the outer end fitting 19 of the spout 20 provides a stop to limit inward sliding movement of the spout in the fitting 14 to the retracted position of Figure 1. The inner end of the spout 20 is provided with an inner end fitting 22 the outermost portion 23 of which engages and is secured to the spout 20. The portion 23 is sized for a free sliding fit in the outer portion 17 of the can fitting 14. An annular shoulder or the like 24 on the inner spout fitting 22 engages the shoulder 25 between the portions 17 and 18 of the can fitting 14 to limit outward sliding movement of the spout 21) to the dispensing position of Figure 2.

The free end of the inner spout fitting 22 is provided with a second annular shoulder or the like 26 which cooperates with the shoulder 24 to define therebetween a fitting portion 27 of reduced diameter. The fitting portion 27 preferably includes a circumferential ridge 28 which provides on opposite sides thereof two oppositely disposed, frusto-conical cam surfaces 29 and 30 which are disposed in base-to-base relation, the combined bases forming the ridge 2%. Any suitable strainer 32 may be carried by the inner spout fitting 22, inwardly thereof. A resilient toroidal ring 31 is mounted on the reduced portion 27 so as to have a relatively tight rolling fit thereon irrespective of its position. That is to say, ring 31 fits sufiiciently tightly as to maintain its position on the reduced portion 27 in the absence of forces moving the same and now to be described.

As is apparent from Figure 1, when spout 20 is retracted, the ring 31 is seated on the cam surface 29 which is the cam surface nearest the can fitting 14. However, the outside diameter of the ring 31 is somewhat greater than the inside diameter of the portion 18 of the can fitting 14. Thus, as the spout 20 is moved to the dispensing position, the inner edge of the can fitting portion 18 engages the ring 31 and compresses the same as the ring enters such can fitting. Continued outward movement of the spout 20 causes the ring 31 to roll on the cam surface 29 of the reduced portion 27 of the inner fitting 22 over the ridge 28 and onto the second cam surface 30. Eventually the ring 31 comes to rest against the shoulder or stop 26. As the ring 31 is still under compression, it is readily apparent that it provides a fluid-tight seal between the spout and the fitting 14. Thus, with the parts in the Figure 2 position, fluid may be dispensed from the can without leakage at the joint between the spout and the fitting 14. At the same time, the cam surface 30 upon which the ring 31 is seated opposes inward movement of the spout 20 so that it is securely held in the dispensing position until sufiicient force is exerted in a retracting direction to roll the ring 31 over the ridge and onto the cam portion 29. It follows then, that the spout 29 may be readily pulled to the dispensing position by merely exerting a straight outward pull thereon. This may be initiated by engaging with a finger the inwardly directed lip or fingergrip 33 formed on the free edge of the outer fitting 19 of the spout. Because the parts have loose sliding fit in the can fitting portion 17, there is little resistance to such movement until the ring 31 engages the can fitting portion 18. Thereafter, sufiicient force must be exerted to compress the ring and roll it over the ridge 28. However, as the parts are self centering, this action may be accomplished easily even under blackout conditions.

Attention is directed to the fact that the arrangement just described eliminates wearing contact between metal surfaces in the sealing areas and that the' ring 31, which is readily replaceable, is the sole part subjected to any material wearing. Such ring is accessible for replacement simply by unscrewing the cap 12 and removing the entire assembly from the can. Also, it should be noted that this form of the invention is readily applicable to any standard container utilizing a cap such as the cap 12 merely by modifying the cap. Thus, U. S. Patents Nos.. 2,387,270 and 2,468,758 show respectively a standard container and cap to which this form of the invention is readily applicable as aforesaid.

In the modification of Figs. 3 and 4, the can wall 40 has secured thereto in any suitable manner a sput 41 which is internally threaded for threaded engagement with a can fitting generally indicated by 42. The fitting 42 has an inner end 43 of reduced size and a central portion 44 of enlarged size. The merger of the portions 43 and 44 defines an annular shoulder 45. The fitting 42 also includes an inwardly directed annular rib 46 which provides a second shoulder in axially outwardly spaced relation to the shoulder 45. Beyond the rib 46, the fitting 42 is formed with an outwardly flared flange 47 which mounts a washer 48 which sealingly engages the sput 41.

The flange 47 is rigidly secured in any suitable manner as by welding to a cap fitting portion 49 which includes an outwardly directed neck 50 which may be externally threaded for threaded engagement with a closure cap 51. The closure cap 51 carries a sealing washer 52. The sput 41 has secured thereto a vent tube 53 which opens therethrough into an annular space 54 provided between the sput 41 and the can fitting 42 in the region of the rib 46. The fitting 42 outwardly of the rib 46 is formed with one or more vent ports 55 providing communication between space 54 and the interior of fitting 42. The cap fitting portion 49 is likewise formed with one or more vent ports 56 opening into fitting 42 which are so located as to be covered and sealed by the washer 52 when the cap 51 is screwed .into place. At the same time, it is obvious that when the cap 51 is removed the can is vented through the vent 53 and ports 55 and 56.

In this form of invention the toroidal ring 57 is mounted in the fitting 42 between the shoulders 45 and 46 thereof. As is apparent from Fig. 3, when the device is in the retracted position, the ring 57 seats against the innermost shoulder 45. A spout 58 includes an outer spout fitting 59 which has a free sliding fit in the neck 50 of the cap portion 49. An outwardly directed shoulder 60 is provided on the outer edge of the spout fitting 59 to seat on the free edge of the neck 50 to limit inward sliding movement of the spout 58 to the retracted position of Fig. 3. As in the preferred form of the invention, the spout fitting 59 may include an inwardly directed flange 61 or other fingerpiece to initiate movement of the spout towards the dispensing position of Fig. 4. The inner end of the spout 58 is provided with an inner spout fitting 62. The fitting 62 has an outer portion 63 formed for a free sliding fit in the neck 50 of the cap portion 49. Inwardly of such portion 63 the fitting 62 is formed with an outwardly directed frustoconical cam surface 64 which terminates in a ridge 65 which in turn merges with an opposite directed frustoconical cam surface 66 disposed in base-to-base relation with the first-named cam surface. The free end of the fitting 62 may be provided with a cylindrical portion 67 which is sized for a sliding fit with the reduced portion 43 of the can fitting 42. As is apparent from Figure 4, the outer cam surface 64 is engageable with the neck 50 to limit movement of the spout 59 toward the dispensing position to such position.

The operation of this form of the invention is substantially the same as that for the first described form. Thus, initial movement of the spout 58 to the dispensing position of Fig. 4 is accomplished without any substantial frictional resistance. However, when the outer portion of the first-mentioned cam surface 64 engages the ring 57, the latter is compressed and rolled axially outwardly in the enlarged portion 44 of the can fitting 42. Eventually, continued outward movement of the spout 58 rolls the ring 57 over the ridge 65 and onto the second cam surface 66. Thus, when the parts reach the Fig. 4 or dispensing position, the ring 57 not only provides a seal between the spout and can fitting but also provides means resiliently retaining the spout 58 in the dispensing position. Likewise, it should be noted that the rmg 57 seals off an annular chamber 68, Fig. 4, outwardly of the rib 46 and into which the venting ports 55 and 56 open. Thus, the can is readily vented while fluid is dispensed therefrom without there being any danger of leakage through the venting ports.

It will be apparent from the foregoing that thls form of the invention operates substantially the same as does the first described form. Also, it is apparent that the entire fitting may be removed from the can by unscrewing the fitting 42 from the sput 41. Likewise, the arrangement is such that there is no metal-to-metal wear and that substantially all of the wear is borne by the ring 57. This ring is readily replaceable after the fitting has been removed from the sput 41 by squeezing it into the enlarged portion 44 through the reduced entrance 43 thereto with, of course, the spout 58 in the retracted position of Fig. 3. This is readily accomplished after the ring has been forced over the inner spout fitting 62 in a manner readily understood.

In the form of Figs. 5 and 6, a can wall 70 has secured thereto in any suitable manner a flange 71 which is provided with an outwardly directed and externally threaded neck 72 to which may be secured any suitable closure cap 73. The can may be provided with a vent tube 74 which opens through the neck 72 as at 75, so that when the cap 73 is in place the vent port 75 is closed. The neck 72 terminates in an inwardly directed annular flange 76 to which is secured in any suitable manner an outwardly directed connector portion 77. The portion 77 is generally cylindrical in form and is formed with an inwardly directed skirt 78 oppositely disposed portions of which are cut away as at 79 and are formed to provide inwardly directed cam surfaces 80, only one of which is shown, and for a purpose now to be described.

A second closure cap 81 is adapted to be secured to the portion 77. Such cap 81 mounts a sealing washer 82 which is adapted to bear against upper edge of the portion 77. The cap'81 also has secured thereto in any suitable manner a can fitting 83 which is formed with a depending skirt 97. Upper portions of the skirt 97 are outwardly struck to provide locking lugs 84 which are introduced through the cutaway portions 79 of the skirt 78. Thereafter a partial turn in a clockwise direction causes the lugs 74 to engage the cam surfaces of the skirt 78 and cam the cap washer 82 into firm engagement with the portion 77 in a well known manner. Below the lugs 84, the can fitting skirt 97 is outwardly flared to provide the substantially frusto-conical inner cam surface 85. Below the cam surface 85 the skirt 97 is inwardly directed to provide an annular shoulder 86 upon which a resilient toroidal sealing ring 87 is normally seated. Below the shoulder 86 the fitting skirt 97 provides a substantially cylindrical neck 88 through which a dispensing spout 89 is extended.

The spout 89 has an outer fitting 91 fixed thereto which has a sliding fit in an outer reduced neck 90 of the can fitting 83. The outer spout fitting 91 is provided with the usual outwardly direct shoulder 92 or the like to limit inward movement of the spout to the retracted position shown in Fig. 5.

Referring now to Fig. 6, it will be noted that the inner end of the spout 89 is provided with an inner spout fitting 93. Such fitting 93 commences with a frustoconical cam surface 94 having a relatively steep angle but which merges at a circumferential ridge 96 into a second and longer frusto-conical cam surface 95 having a very slight angle. That is, the cam surface 94 in effect uses the frustrum of the cam surface 95 as a base. As is apparent from Fig. 6, the inner end of the fitting 93 has a close sliding fit with the inner neck 88 of the can fitting when the parts are in the dispensing position. In like manner, the outer end of the cam surface 94 has a wedging fit in the restricted neck 90 of the cam fitting whereby to limit outward movement of the spout 89 to the dispensing position of Fig. 6.

In operation and as in the first described forms of the invention, the initial movement of the spout 89 towards the dispensing position is without any substantial resistance until the relatively steep cam surface 94 engages the ring 87. Thereafter, increased force must be exerted to move the spout to the dispensing position. At

noabsi the same time, the ring 87 is compressed and rolled upon the cam surface 94 and onto the cam surface 95 against the resistance provided by the opposed cam surface 85 of the can fitting 83. The merger of the cam surfaces 94 and 95 provides a ridge 96 so that when the spout is in the dispensing position the distance between the ridge 96 and the opposed cam surface 85 is less than the distance between the opposed cam surfaces 85 and 95. Thus, retracting movement of the spout is resisted by the combined action of the cam surfaces 85 and 95 on the ring 87 until the ring has rolled over the ridge 96. Thereafter, the relative steep slope of the outer cam surface 94 pfefrmits the spout to be retracted with considerably less e ort.

Here again, there is substantially little metal-to-metal friction and resultant wear, virtually all the wear being borne by the readily replaceable ring 87.

In both the Fig. 3 and Fig. 5 forms of the invention, the caps 51 and 73 respectively mount pivot providing means 36 which correspond to the pivot pin 34 of the Fig. 1 form of the invention. A swivel arm 37 is piv oted to each means 36 and the free end of each arm 37 is formed with an eye 38 whereby any suitable tether (not shown) may be attached thereto for connecting the cap to wall 40 or 70.

It is important to note that in all forms of the invention the user need not be delayed by seeking to unscrew or screw together a threaded connection, a bayonet slot connection or the like and is able to move any spout to and from the dispensing and retracting positions solely by the exertion of force in a straight line direction axially of the spouts. Moreover, in all forms of the invention positive means in the form of the compressed ring and the ridges formed on the fittings serve to resiliently and positively lock the spouts in the dispensing positions. At the same time the resistance to retracting movement may be readily overcome by the exertion of force in a straight line retracting direction. Obviously, in all forms, the resilient rings effectually seal the joints between the inner spout fittings and the can fittings.

Moreover, while I have shown and described what are now thought to be the preferred embodiments of the invention, it is understood that the same is susceptible of other forms and expressions. Consequently, I do not limit myself to the precise structures shown and described hereinabove except as hereinafter claimed.

I claim:

1. In a disappearing spout for a dispensing can, the combination with a tubular discharge spout mounted in a wall of said can for axially sliding movement through said wall to and from a dispensing position substantially entirely outwardly of said can and a non-use position substantially entirely inwardly of said can; of means for securing said spout in said dispensing position and simultaneously providing a seal between said spout and said can wall, said means including a tubular fitting in said wall through which said spout extends and a cooperating fitting on said spout in the region of the inner end thereof, said last-named fitting being telescoped within said firstnamed fitting when said spout is in said dispensing position, at least one of said fittings being formed with an annular circumferential ridge providing oppositely sloping cam surfaces on either side thereof, a resilient sealing ring carried by one of said fittings concentrically thereof, said ring being compressed between said fittings and rolled over said ridge as said spout is moved to said dispensing position, said ridge cooperating with said ring to resist return movement of said spout to said non-use position, and said ring providing a seal between said fittings.

2. In a disappearing spout for a dispensing can, the combination with a tubular discharge spout mounted in a wall of said can for axially sliding movement through said wall to and from a dispensing position substantially entirely outwardly of said can and a non-use position substantially entirely inwardly of said can; of means for securing said spout in said dispensing position and simultaneously providing a seal between said spout and said can wall, said means including a tubular fitting in said wall through which said spout extends and a cooperating fitting on said spout in the region of the inner end thereof, said last-named fitting being telescoped within said first-named fitting when said spout is in said dispensing position, at least one of said fittings being formed with an annular circumferential ridge providing oppositely sloping cam surfaces and valleys on either side thereof, one

of the valleys being shallower than the other, a resilient sealing ring carried by one of said fittings concentrically thereof, said ring being compressed between said fittings and rolled over said ridge into said shallower valley as said spout is moved to said dispensing position, said ring being maintained partially compressed in said shallower valley, whereby to cooperate with said ridge to resist movement of said spout to said non-use position.

3. In a disappearing spout for a dispensing can, the combination with a spout mounted in a can wall through which said spout is slidable to and from a dispensing position substantially entirely outwardly of said can and a retracted position substantially entirely inwardly of said can; of a tubular fitting fixed to said wall, said spout having a loose sliding fit in said fitting, said fitting having a substantially straight interior wall of circular cross section, said spout having an inner end, a second fitting carried by said inner end, said second fitting being of generally cylindrical shape and having a central portion of reduced cross section providing shoulders at opposite ends thereof, said central portion being formed with an annular ridge, oppositely inwardly directed frustro-conical cam surfaces on opposite sides of said ridge, a resilient sealing ring normally on the cam surface nearest said first-named fitting, said ring engaging said first-named fitting and being compressed thereby as said spout is moved to said dispensing position and rolled thereby over said ridge, and said ring seating on the other cam surface when said spout reaches said dispensing position, whereby said ring provides a seal for said fittings and said ring and ridge provide means resisting return movement of said spout to said retracted position.

4. The structure of claim 3, wherein said cam surface nearest said first-named fitting comprises a relatively short and steep upper cam surface, and said other cam surface comprises a relatively long and less steep lower cam surface.

5. The structure of claim 4, wherein. said upper cam surface has an upper end intersecting a shoulder of said fitting of said spout to provide an upper seat for said ring,

said lower cam surface having a lower end intersecting the other shoulder of such fitting to provide a lower seat for said ring, and said lower seat being radially outwardly of said upper seat.

6. ].n a disappearing spout for a dispensing can, the combination with a tubular discharge spout mounted in a wall of said can for axially sliding movement through said wall to and from a dispensing position substantially entirely outwardly of said can and a non-use position substantially entirely inwardly of said can; of means for securing said spout in said dispensing position and simultaneously providing a seal between said spout and said can wall, said means including a tubular fitting in said wall through which said spout extends and a cooperating fitting on said spout in the region of the inner end thereof, said last-named fitting being telescoped within said first- -named fitting when said spout is in said dispensing position, at least one of said fittings being formed with an annular circumferential ridge providing oppositely sloping cam surfaces and valleys on either side thereof, one of the valleys being shallower than the other, a resilient sealing ring carried by said fitting on said spout, said ring being compressed and rolled over said ridge into said shallower valley as said spout is moved to said dispensing position, said ring being maintained partially compressed in said shallower valley, whereby to cooperate with said ridge to resist movement of said spout to said non-use position.

7. In a disappearing spout for a dispensing container, the combination with a container wall through which said spout slides to and from a dispensing position and a retracted position; of a tubular fitting in said wall concentrically of said spout, said spout having an inner end mounting a second fitting, said second fitting telescoping within said first-named fitting in spaced relation thereto when said spout is in said dispensing position, said fitting on said spout being formed with two successive frustroconical cam surfaces of different angularity so as to provide a ridge therebetween, a resilient sealing ring carried .by one of said fittings concentrically of said spout, said ring being compressed between said fittings and rolled over said ridge from one cam surface to the other as said spout is moved to said dispensing position, and said ridge and compressed ring comprising means for resiliently locking said spout in said dispensing position.

8. In a disappearing spout for a dispensing container, the combination with a container wall through which said spout slides to and from a dispensing position and a retracted position; of a tubular fitting in said wall concentrically of said spout, said spout having an inner end mounting a second fitting, said second fitting telescoping within said first-named fitting in spaced relation thereto when said spout is in said dispensing position, one of said fittings being formed with two successive frustro-conical cam surfaces of different angularity so as to provide a ridge therebetween, a resilient sealing ring carried by one of said fittings concentrically of said spout, said ring being compressed between said fittings and rolled over said ridge from one cam surface to the other as said spout is moved to said dispensing position, and said ridge and compressed ring comprising means for resiliently locking said spout in said dispensing position.

9. In a disappearing spout for a dispensing container, the combination with a container wall through which said spout slides to and from a dispensing position and a retracted position; of a tubular fitting in said wall concentrically of said spout, said spout having an inner end mounting a second fitting, said second fitting telescoping within said first-named fitting in spaced relation thereto when said spout is in said dispensing position, one of said fittings being formed with two successive frustro-conical cam surfaces, one cam surface using as a base the frustrum of the other cam surface and having a steeper slope so as to provide a ridge therebetween, a resilient sealing ring carried by one of saidfittings concentrically of said spout, said ring being compressed between said fittings and rolled over said ridge from one cam surface to the other as said spout is moved to said dispensing position, and said ridge and compressed ring comprising means for resiliently locking said spout in said dispensing position.

10. In a disappearing spout for a dispensing container, the combination with a container wall through which said spout slides to and from a dispensing position and a retracted position', of a tubular fitting in said wall concentrically of said spout, said spout having an inner end mounting a second fitting, said second fitting telescoping within said first-named fitting in spaced relation thereto when said spout is in said dispensing position, one of said fittings beingformed with two successive frustroconical cam surfaces, one cam surface using as a base the frustrum of the other cam surface and having a shorter and steeper slope so as to provide a ridge therebetween, a resilient sealing ring carried by one of said fittings concentrically of said spout, said ring carried by one of said fittings concentrically of said spout, said ring being compressed between said fittings and rolled over said ridge from said shorter and steeper cam surface to the other as said spout is moved to said dispensing position, and said ridge and compressed ring comprising means for resiliently locking said spout in said dispensing position.

11. In a disappearing spout for a dispensing container, the combination with a container wall through which said spout slides to and from a dispensing position and a retracted position; of a tubular fitting in said wall concentrically of said spout, said spout having an inner end mounting a second fitting, said second fitting telescoping within said first-named fitting in spaced relation thereto when said spout is in said dispensing position, said fitting on said spout being formed with two successive frustroconical cam surfaces in base-to-base relation so as to provide a ridge therebetween, a resilient toroidal sealing ring having a relatively tight rolling fit on the cam surface nearest said first-named fitting, said ring being compressed between said fittings and rolled over said ridge onto the other cam surface as said spout is moved to said dispensing position, and said ridge and compressed ring comprising means for resiliently locking said spout in said dispensing position.

12. The structure of claim 11, wherein said fitting on said spout includes radially outwardly projecting means on opposite ends thereof to retain said ring thereon.

13. In a'disappearing spout for a'dispensing can, the combination with a can wall through which said spout slides to and from a dispensingposition and a retracted position; of a tubular wall fitting in said wall slidably mounting said spout, a spout fitting on the lower end of said spout telescoping within said wall fitting when said spout is in said dispensing position, a resilient sealing ring carried by said wall fitting, said spout fitting being formed with a substantially frustro-conical cam surface in facing relation to said wall fitting for engagement with said ring, said cam surface terminating in an annular ridge, said spout fitting being formed with a shorter and oppositely sloping cam surface beyond said ridge, and said ring being compressed between said fittings and rolled over said first-named cam surface and ridge onto said second-named cam surface as said spout is moved into said dispensing position, whereby to resist return movement of said spout to said retracted position.

14. In a disappearing spout for a dispensing can, the combination with a can wall through which said spout slides to and from a dispensing position and a retracted position; of a tubular wall fitting in said wall slidably mounting said spout, a spout fitting on the lower end of said spout telescoping within said wall fitting when said spout is in said dispensing position, a resilient sealing ring carried by said spout fitting, said spout fitting being formed with a substantially frustro-conical cam surface in facing relation to said wall fitting for engagement with said ring, said cam surface terminating in an annular ridge, said spout fitting being formed with a shorter and oppositely slopingcam surface beyond said ridge, and said ring being compressed between said fittings and rolled over said first-named cam surface and ridge onto said second-named cam surface as said spout is moved into said dispensing position, whereby to resist return movement of said spout to said retracted position.

References Cited in the file of this patent UNITED STATES PATENTS 1,877,226 Chamberlain Sept. 13, 1932 1,985,899 Jahn Jan. 1, 1935 2,044,208 Conner et al. June 16, 1948 2,622,772 Tamminga Dec. 23, 1952 FOREIGN PATENTS 263,628 Great Britain Jan. 6, 1927 

